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    Tytuł:
    Kupować lokomotywy, czy wypożyczać ?
    Autorzy:
    Muller, C.
    Ratecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/254171.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    OPNV
    pojazdy szynowe
    przedsiębiorstwa komunikacji kolejowej (EVU)
    reforma kolejnictwa
    sieć kolejowa DB AG
    Unia Europejska
    Opis:
    Wraz z pierwszym stopniem reformy kolejnictwa, stosownie do dyrektywy Unii Europejskiej nr 91/440 umożliwiony zosta? swobodny dostęp do sieci DB AG dla podmiotów trzecich. Od tej pory przedsiębiorstwa komunikacji kolejowej (EVU), które otrzymały zezwolenia mogą, uiszczając opłatę za użytkowanie trasy, prowadzić pociągi po sieci kolejowej DB AG. W następstwie reformy, szczególnie w ruchu regionalnym, rozwinęła się ożywiona konkurencja. Zarówno rząd federalny, jak i kraje związkowe, zachęcone pieniędzmi za źródła OPNV (publiczny regionalny transport pasażerski), mogły występować w roli zamawiającego usługi komunikacyjne i wpływać stymulująco na rozwój usług w tym sektorze komunikacji regionalnej. Po sześciu latach wszędzie jeżdżą już nowoczesne pojazdy, należące zarówno do DB AG, jak i do różnych regionalnych kolei, i to przy bardzo napiętym rozkładzie jazdy.
    Źródło:
    TTS Technika Transportu Szynowego; 2000, 7, 10; 37-39
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and control of mechatronic systems by the descriptor approach
    Modelowanie i sterowanie układów mechatronicznych metodą deskrypcyjną
    Autorzy:
    Muller, P. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/280382.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    układy mechatroniczne
    układy deskrypcyjne
    optymalna kontrola
    descriptor systems
    mechatronic systems
    optimal control
    Opis:
    In recent years, the analysis and synthesis of control systems in a descriptor form has been established. The general description of dynamical systems by differential-algebraic equations (DAE) is important for many applications in various disciplines, but particularly in mechatronics. In this contribution, the pros and cons of the modelling of mechatronic systems by differential-algebraic equations are discussed with application of subsystem modelling. Additionally, the actual state of the art simulation, analysis and design of descriptor systems are presented.
    W ostatnich latach sformułowano i spopularyzowano problem analizy i syntezy układów sterujących w postaci deskrypcyjnej. Ogólny opis układów dynamicznych za pomocą równań różniczkowo-algebraicznych (DAE) ma ogromne znaczenie aplikacyjne w różnych dziedzinach nauki, w szczególności w zakresie mechatroniki. W prezentowanej pracy przedyskutowano wszystkie "za" i "przeciw" modelowania układów mechatronicznych równaniami różniczkowo-algebraicznymi z zastosowaniem podziału opisywanego układu na podsystemy. Ponadto przedstawiono najnowocześniejsze metody symulacji, analizy i projektowania układów deskrypcyjnych.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2005, 43, 3; 593-607
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comment on the remark by G. A. Kurina on the paper (Müller, 1998)
    Autorzy:
    Müller, P. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/908513.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 595-595
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of neo-tectonics in the variation of the relative mean sea level throughout the last 6000 years on the Taman Peninsula (Black Sea, Azov Sea, Russia)
    Autorzy:
    Fouache, E.
    Porotov, A.
    Müller, C.
    Gorlov, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187360.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sea level
    geoarchaeology
    neotectonics
    Holocene
    Black Sea
    Russia
    Opis:
    Sediments, carbon-datings on seashells, allow us to reconstruct the evolution of the average sea level for some 6000 years on the Taman Peninsula. The current sea level, regionally, appears to be the highest level ever reached on the peninsula. It seems that for the Anapa area and Tchouchtchka Spit area it is possible to propose a sea level curve characterised by a slow, continuous rising during the past 6000 years. On the Taman Peninsula itself, the sedimentary record of this slow ascent has been distorted by a heavy tectonic subsidence. We have identified this neo-tectonic subsidence effect on at least two areas on the peninsula. The south of the peninsula, Burgaz Spit and Vityazevos Lagoon, is the most affected area. The Taman Gulf is an intermediate area. The tectonic subsidence is particularly noticeable from 1500 to 500 BC, which we believe to have been misinterpreted until now, and to be at the origin of the notion of "Phanagorian Regression".
    Źródło:
    Polish Geological Institute Special Papers; 2004, 11; 47-57
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods
    Autorzy:
    Teich, L.
    Schröder, C.
    Müller, C.
    Patel, A.
    Meyer, J.
    Hütten, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385684.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Mg
    75.75.Jn
    75.78.-n
    Opis:
    We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 374-376
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new finite element technique for a phase field model of brittle fracture
    Nowa metoda elementów skończonych dla modelu pól fazowych przy opisie kruchego pękania
    Autorzy:
    Kuhn, C.
    Muller, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/281852.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    phase field
    fracture
    finite elements
    exponential shape functions
    Opis:
    Phase field models for fracture employ a continuous field variable to indicate cracks. The width of the transition zone between cracked and uncracked areas is controlled by a regularization parameter. The numerical implementation of such models is sensible to the choice of this parameter in conjunction with the mesh size, as the mesh has to be fine enough to resolve high gradients of the crack field appearing in the transition zones. This is the main computational limit and challenge of the implementation. To overcome this limitation, a finite element method using exponential shape functions is introduced. Numerical examples show that these new shape functions perform better than standar Lagrange shape functions.
    Modele pól fazowych w opisie procesu pękania wykorzystują zmienne ciągłe pola do wykrywania pęknięć. Szerokość strefy przejściowej pomiędzy obszarem pęknięcia a nieuszkodzonym jest opisana parametrem regularyzacji. Numeryczna implementacja takich modeli jest wrażliwa na dobór tego parametru w połączeniu z rozmiarem siatki elementów skończonych, która musi być odpowiednio gęsta, by uwzględnić duże gradienty pola z pęknięciem w strefie przejściowej. Jest to główne ograniczenie w przeprowadzaniu obliczeń i duże wyzwanie symulacyjne. W pracy zaproponowano użycie wykładniczych funkcji kształtu do metody elementów skończonych w celu eliminacji tego ograniczenia. Przedstawione przykłady pokazały, że zastosowanie funkcji wykładniczych zamiast standardowych funkcji Lagrange’a wyraźnie poprawiło wydajność numeryczną modeli.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2011, 49, 4; 1115-1133
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexible coupling of drive and guide elements for parallel-driven feed axes to increase dynamics and accuracy of motion
    Autorzy:
    Peukert, C.
    Merx, M.
    Müller, J.
    Ihlenfeldt, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/99992.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    compliant mechanism
    parallel-driven feed axis
    machine tool
    control bandwidth
    Opis:
    Productivity enhancement is achievable by increasing the dynamics of machines. This can be accomplished by decreasing the moving mass or by increasing the driving forces. One possibility for increasing the drive forces lies in the use of multiple parallel-acting actuators. Because of the mechanical coupling between the drives, undesirable interference of the actuators occurs. This limits the control bandwidth of the feed axis. Feed axes of machine tools are mostly equipped with linear guides fitted with rolling elements. Since they dispose of just one degree of freedom, small errors in their alignment or thermally induced errors cause constraining loads. In this paper compliant mechanisms are used to mechanically decouple the slide from the guide and drive elements. The application of flexible joints in gantry axes with linear motors and ball screws is investigated. The dynamic behaviour of the feed axis components are modelled using the Finite Element Method. By applying the modal reduction technique, the dynamic behaviour is included in an elastic multibody simulation. With the mechanical decoupling of the drive and guide elements it is possible to increase the control bandwidth of the system. Deviations in motion may also be corrected with parallel-driven feed axis by applying compliant mechanisms.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 2; 77-89
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new glimpse on trophic interactions of 100-million-year old lacewing larvae
    Autorzy:
    Hornig, M.K.
    Kiesmuller, C.
    Muller, P.
    Haug, C.
    Haug, J.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082238.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Neuroptera
    Nymphidae
    food-web reconstruction
    Burmese amber
    larvae
    syninclusions
    Cretaceous
    Myanmar
    Opis:
    Larvae of lacewings (Neuroptera) are known to be fierce predators. According to the morphology of fossil forms this seems to have been the case already in the Early Cretaceous. While being predators, lacewing larvae are also food items for other organisms. Here we report two pieces of amber from Myanmar providing instances of such cases. In one amber piece several isolated stylets of lacewing larvae are preserved closely associated together. The most likely interpretation is that a predator preying on lacewing larvae has regurgitated or defecated these non-digestible pieces, yet the identity of the predator remains unclear. The other amber piece preserves a larva resembling modern day larvae of split-footed lacewings (Nymphidae). The larva has projections on its trunk, allowing it to wear a camouflaging cloak. In the head region, a mite (Acari) is attached to the larva; more precisely, the entire anterior body region of the mite is apparently inserted into the lacewing larva. The mite is smaller than the larva. It is known from the modern fauna that stage 1 larvae of Ascalaphidae can be attacked also by rather small predators, such as ants. The mite can therefore well be interpreted as a true predator instead of a parasite, especially considering the unusual mode of attachment. We briefly review interactions of lacewing larvae with other organisms represented in amber from Myanmar and add two new pieces to the puzzle of reconstructing the trophic interactions in the 100-million-year old amber forest.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 4; 777-786
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent hybrid material slide component for machine tools
    Autorzy:
    Möhring, H. C.
    Wiederkehr, P.
    Baumann, J.
    König, A.
    Spieker, C.
    Müller, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/100179.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    process stability simulation
    thermal analysis
    machine tool
    Opis:
    In mid-scale and large five axis overhead gantry type milling machines, the vertical z-slide (ram) often constitutes one of the most sensitive and critical components regarding stiffness, structural vibrations and thermal influences. During machining, the z-slide is loaded by (quasi-) static process and drive forces, transient acceleration forces, periodic excitations by the tool engagement, as well as by thermal effects resulting from altering ambient conditions, heated chips, cooling lubricant and power losses in drives, guides and bearings. Deflections, thermal deformations and vibrations of the z-slide lead to geometric machining errors and inacceptable surface location errors at the workpieces. Furthermore, instable cutting conditions and regenerative chatter limit applicable material removal rates and, thus, productivity. In this work, a newly developed hybrid material structure for an exemplary z-slide, involving metal parts and mineral cast, is introduced. Structural optimization methods as well as process simulation techniques were applied in order to derive the final design solution. The integration of active cooling circuits for thermal stabilization is investigated and the use of fibre optical strain sensors is analysed with respect to a state monitoring of the machine tool component.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 1; 17-30
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustainable increases of energy efficiency by holistically considered structures of factory systems
    Autorzy:
    Richter, C.
    Fischer, S.
    Neugebauer, R.
    Müller, E.
    Schädlich, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/99737.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    factory building
    process
    energy interaction
    Opis:
    A number of efficient solutions are already in existence today for reducing specific energy and raw material needs, and they are continuously being improved. Since the competition between individual solutions for sustained energy efficiency may prove to be an obstacle to the system as a whole, the interaction of individual elements and sub-systems in complex domains must be considered in an integrated way with an eye to their reciprocal energy effects. What will be the impact of energy savings resulting from innovative approaches and intelligent solutions at a single systemic level on the system as a whole? Do they serve to reduce overall energy costs? What kinds of energy-related information are necessary to answer these questions? This article examines the issue of how dedicated energy savings in the production sector impact on the total energy requirement in factory systems. In one example, process and building are examined together in order to thereby recognize energy relationships. It was demonstrate that waste heat from machine tools has a significant impact on the factory hall climate and therefore on the heating needs of factory buildings. A model calculation demonstrated that energy savings at individual system levels are transferable to the entire system in direct proportion to the energy efficiency of the building.
    Źródło:
    Journal of Machine Engineering; 2011, 11, No. 1-2; 11-22
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Stray Field Detection as Guidance for Electronic Transport Measurements in the B-T Phase Diagram of MnSi
    Autorzy:
    Pohlit, M.
    Witt, S.
    Akbari, M.
    Krellner, C.
    Müller, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030531.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.55.Ge
    72.15.Eb
    72.80.Ga
    75.30.-m
    Opis:
    In order to advance modern information technologies, progress in both the fabrication of magnetic nanostructures and of complex materials, from which small magnetic entities - like the skyrmions present in MnSi - emerge and in developing measurement techniques are desired. Here the sensor-based stray field detection using tailor-made micro-Hall magnetometers has proven to be a versatile tool for studying the magnetization reversal of individual magnetic nanostructures, domain wall motion in thin films, as well as the local stray field close to macroscopic samples. In this article we demonstrate that the local stray field can be used to accurately map out the B-T phase diagram of MnSi and serve as a guidance for simultaneously-performed electronic transport measurements. The presented study also serves as a proof-of-principle experiment for future combined investigations of electronic transport and magnetization focusing on electrically-contacted magnetic nanostructures.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 582-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of an artificial neural network and morphing techniques in the redesign of dysplastic trochlea
    Autorzy:
    Cho, K. J.
    Müller, J. H.
    Erasmus, P. J.
    Dejour, D.
    Scheffer, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/307312.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    artificial neural network
    trochlea redesign
    trochlear dysplasia
    trochleoplasty
    trochlea morphing
    sztuczna sieć neuronowa
    bloczek
    biomechanika
    Opis:
    Segmentation and computer assisted design tools have the potential to test the validity of simulated surgical procedures, e.g., trochleoplasty. A repeatable measurement method for three dimensional femur models that enables quantification of knee parameters of the distal femur is presented. Fifteen healthy knees are analysed using the method to provide a training set for an artificial neural network. The aim is to use this artificial neural network for the prediction of parameter values that describe the shape of a normal trochlear groove geometry. This is achieved by feeding the artificial neural network with the unaffected parameters of a dysplastic knee. Four dysplastic knees (Type A through D) are virtually redesigned by way of morphing the groove geometries based on the suggested shape from the artificial neural network. Each of the four resulting shapes is analysed and compared to its initial dysplastic shape in terms of three anteroposterior dimensions: lateral, central and medial. For the four knees the trochlear depth is increased, the ventral trochlear prominence reduced and the sulcus angle corrected to within published normal ranges. The results show a lateral facet elevation inadequate, with a sulcus deepening or a depression trochleoplasty more beneficial to correct trochlear dysplasia.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 75-84
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonant Photoemission Study of Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te
    Autorzy:
    Orlowski, N.
    Janowitz, C.
    Müller, A.
    Manzke, R.
    Kowalski, B. J.
    Orłowski, B. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963395.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    79.60.-i
    Opis:
    Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te has been studied by means of the resonant photoemission spectroscopy in the constant final states, constant initial states and energy distribution curves modes. In the constant final states spectrum of the well-known giant resonance at the 4d-4f threshold around 150 eV we were able to resolve a peak of the multiplet structure that has not previously been found. Spectra were also taken at the 4p-5d threshold around 280 eV revealing a double structure with antiresonating behaviour.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 847-850
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    R&D of novel medicinal materials for curing cancer: sugar modified Gd-DTPA MRI contrast agents and phospha sugar anti-cancer agents
    Autorzy:
    Yamashita, Y.
    Yamashita, M.
    Fujie, M.
    Suyama, K. A. T.
    Ito, S.
    Reddy, V. K.
    Yamada, M.
    Ogawa, K.
    Ozaki, N.
    Nakamura, S.
    Aoki, T.
    Yu, G.
    Aoshima, K.
    Kato, T.
    Kamikage, N.
    Kiyofuji, K.
    Takehara, Y.
    Sakahara, H.
    Takayanagi, H.
    Oshikawa, T.
    Laurent, S.
    Burtea, C.
    Van der Elst, L.
    Muller, R. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/385218.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    MRI contrast agent
    sugar-ball-dendrimer
    Gd (III)-DTPA complex
    phospha sugars
    phospholanes
    anticancer agent
    tumor
    Opis:
    Novel Sugar Dendritic Gd-DTPA Complexes for MRI Contrast Agents were prepared and evaluated by in vitro and in vivo methods. The sugar dendritic MRI contrast agents have a good blood vesse pool character, and draw blood vessels and liver cancer remarkably clearer than the clinically using Gd-DTPA. Phospha sugar derivatives or phosphorus heterocyclic derivatives provided by functional groups such as epoxide, bromide, etc., were prepared and evaluated by MTT in vitro method. These phospha sugar derivatives showed excellent activities against leukemia cells as well as solid cancer cells in fashions of (i) higher activity, (ii) wider spectra, (iii) higher selectivity and specificity distingushing healthy and cancer cells, etc., compared with the molecular targeting chemotheraputic anti-cancer agent, Gleevec.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 80-83
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium for antihydrogen production in the AEGIS experiment
    Autorzy:
    Consolati, G.
    Aghion, S.
    Amsler, C.
    Bonomi, G.
    Brusa, R.
    Caccia, M.
    Caravita, R.
    Castelli, F.
    Cerchiari, G.
    Comparat, D.
    Demetrio, A.
    Di Noto, L.
    Doser, M.
    Evans, C.
    Fanì, M.
    Ferragut, R.
    Fesel, J.
    Fontana, A.
    Gerber, S.
    Giammarchi, M.
    Gligorova, A.
    Guatieri, F.
    Haider, S.
    Hinterberger, A.
    Holmestad, H.
    Kellerbauer, A.
    Khalidova, O.
    Krasnicky, D.
    Lagomarsino, V.
    Lansonneur, P.
    Lebrun, P.
    Malbrunot, C.
    Mariazzi, S.
    Marton, J.
    Matveev, V.
    Mazzotta, Z.
    Müller, S.
    Nebbia, G.
    Nedelec, P.
    Oberthaler, M.
    Pacifico, N.
    Pagano, D.
    Penasa, L.
    Petracek, V.
    Prelz, F.
    Prevedelli, M.
    Ravelli, L.
    Rienaecker, B.
    Robert, J.
    Røhne, O.
    Rotondi, A.
    Sandaker, H.
    Santoro, R.
    Smestad, L.
    Sorrentino, F.
    Testera, G.
    Tietje, I.
    Widmann, E.
    Yzombard, P.
    Zimmer, C.
    Zmeskal, J.
    Zurlo, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057954.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    04.80.Cc
    07.77.-n
    36.10.Dr
    78.70.Bj
    Opis:
    The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H̅, a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H̅ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n⁴, n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n=3 state; a second laser pulse (tunable in the range 1650-1700 nm) will further excite Ps to the Rydberg state.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1443-1449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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